Built by Robert Stephenson and opened on 5th March 1850 the Britannia was originally a tubular bridge to carry the railway on its way to Holyhead but a disastrous fire in 1970 resulted in the bridge being closed and rebuilt as both a railway and a road bridge, the railway running on the lower platform and the road above. Visually it is very different from its previous form, the two arches now providing delicate reflections in the waters of the Menai Strait.